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Laser cladding process development for high carbon steel substrates

Author: Lengopeng, T ; Botes, A ; Popoola, API Date: Nov 2014 This paper evaluates the effect of process parameters (laser power and scanning velocity) on clad layer height, heat affected zone (HAZ) width, metallurgical bonding to base metal and Vickers microhardness profiles of clad layers of various ... Read more
Laser coating of hafnium on Ti6Al4 for biomedical applications

Author: Phume, L ; Pityana, Sisa L ; Meacock, C ; Popoola, API Date: Dec 2012 The objectives of this study were to investigate laser surface coating of Ti6Al4V with preplaced Hafnium powder, and to determine the influence of the energy density on the characteristics of bonding and the microstructure. Read more
Laser coating of zirconium and ZrO(sub2) composites on Ti(sub6)Al(sub4)V for biomedical applications

Author: Baloyi, NM ; Popoola, API ; Pityana, Sisa L Date: May 2014 Coating is a technology for improving the surface properties of components. Laser coating produces uniform composition with thickened layers that display a good metallurgical bond to the base material. These coatings are dense and crack-free, ... Read more
Laser deposition of (Cu + Mo) alloying reinforcements on AA1200 substrate for corrosion improvement

Author: Popoola, API ; Pityana, Sisa L ; Popoola, OM Date: Oct 2011 Poor corrosion performance of aluminium alloys in marine environment has been a subject of intensive research recently. Aluminium substrate was alloyed with a combination of two metallic powders (Cu + Mo) using an Nd: YAG solid state laser. ... Read more
Materials for electrocatalysts in proton exchange membrane fuel cell: A brief review

Author: Alabi, S ; Popoola, API ; Popoola, OM ; Mathe, Ntombizodwa R ; Abdulwahab, M Date: Feb 2023 Energy is a requisite factor for technological advancement and the economic development of any society. Currently, global energy demand and supply largel rely on fossil fuels. The use of fossil fuels as a source of energy has caused severe ... Read more
Microhardness and wear behaviour of surface modified Ti6Al4V/Zr-TiC metal matrix composite for advanced material

Author: Popoola, API ; Ochonogor, OF ; Abdulwahab, M ; Pityana, Sisa L ; Meacock, C Date: Dec 2012 Surface modification of titanium alloy (Ti-6Al-4V) was made using a Rofin Sinar 4 kW Nd: YAG laser. A laser multi-track 50% overlapping process was employed to produce Zr and Zr-TiC metal matrix composite (MMC) coatings on Ti6Al4V substrate. ... Read more
Microstructural and tribological behavior of in situ synthesized Ti/Co coatings on Ti-6Al-4V alloy using laser surface cladding technique

Author: Adesina, OS ; Popoola, API ; Pityana, Sisa L ; Oloruntoba, DT Date: Nov 2017 The enhancement of the tribological properties of titanium (Ti-6Al-4V) has been the subject of wide range research over the years. The constraints associated with Ti-6Al-4V in severe tribological conditions due of its low hardness and poor ... Read more
Microstructural evolution at the overlap zones of 12Cr martensitic stainless steel laser alloyed with TiC

Author: Adebiyi, DI ; Popoola, API ; Pityana, Sisa L Date: Sep 2014 Multiple track laser alloying is characterised by additional heat treatment and differences in the amount of powder deposited at the overlap regions. These result in different microstructural and phase evolution at these regions, which are ... Read more
Microstructural evolution at the overlap zones of 12Cr martensitic stainless steel laser alloyed with TiC

Author: Adebiyi, DI ; Popoola, API ; Pityana, Sisa L Date: Sep 2014 Multiple track laser alloying is characterised by additional heat treatment and differences in the amount of powder deposited at the overlap regions. These result in different microstructural and phase evolution at these regions, which are ... Read more
Microstructure and corrosion behavior of laser synthesized cobalt based powder on Ti-6Al-4V

Author: Adesina, OS ; Popoola, API ; Pityana, Sisa L ; Oloruntoba, DT Date: 2018 The corrosion behavior of titanium alloys when used for various dynamic offshore components has been a major concern of titanium drilling risers in deepwater energy extraction. A way of achieving specified requirement is the development of ... Read more
Microstructure and mechanical properties of heat-treated Ti-Al-Si alloy produced via laser in situ alloying

Author: Raji, SA ; Popoola, API ; Pityana, Sisa L ; Monnamme, Tlotleng Date: Mar 2021 Intermetallics based on gamma titanium aluminide ( -TiAl) alloys are potential lightweight materials that can be used for high-temperature components. However, poor room temperature ductility hinders their full potential for producing components ... Read more
Microstructure and microhardness characterization of Cp-Ti/SiAlON composite coatings on Ti-6Al-4V by laser cladding

Author: Sibisi, PN ; Popoola, API ; Kanyane, LR ; Fatoba, OS ; Adesina, OS ; Arthur, Nana KK ; Pityana, Sisa L Date: Mar 2019 Failure of engineering components on application is mainly a result of poor surface behavior of materials under certain conditions. Titanium and its alloys have numerous beneficial properties including light weight, high strength and excellent ... Read more
Modelling and simulation of the fatigue usage factor of y-TiAl alloy fabricated through Laser Additive Manufacturing (LAM)

Author: Raji, SA ; Popoola, API ; Pityana, Sisa L ; Popoola, OM ; Arthur, Nana KK ; Tlotleng, Monnamme Date: Oct 2021 Recently, laser additive manufacturing (LAM) technologies are increasingly being applied for producing components with excellent physical and mechanical properties in the aerospace, automotive and energy industries. This work is aimed at ... Read more
Morphological characterisation of recycled powder and microstructures of Ti-6Al-4V components synthesized by LENS additive manufacturing

Author: Sibisi, PN ; Popoola, API ; Arthur, Nana KK ; Pityana, Sisa L ; Popoola, OM Date: Oct 2019 Direct Metal Laser Deposition (DMLD) processes such as LENS are gaining ground in commercial manufacturing processes of functional end-products. This is attributed to this process being popularized as a sustainable technology with the potential ... Read more
Residual stress modelling and experimental analyses of Ti6Al4V ELI additive manufactured by laser engineered net shaping

Author: Ngoveni, AS ; Popoola, API ; Arthur, Nana KK ; Pityana, Sisa L Date: Mar 2019 This paper focus on the experimental analyses and modelling of the residual stresses build up during laser additive manufacturing by Laser Engineered Net Shaping. Currently, additive manufactured parts employ heat treatment for the reduction ... Read more
Review on direct metal laser deposition manufacturing technology for the Ti-6Al-4V alloy

Author: Sibisi, Percival N ; Popoola, API ; Arthur, Nana KK ; Pityana, Sisa L Date: Mar 2020 Direct laser metal deposition (DLMD) is a breaking edge laser-based additive manufacturing (LAM) technique with the possibility of changing the perception of design and manufacturing as a whole. It is well suitable for building and repairing ... Read more
A study on scan speed relationship with microstructural evolution, phase composition and microhardness of Ni-containing intermetallic coatings on Ti–6Al–4V using cladding technique

Author: Adesina, OS ; Popoola, API ; Pityana, Sisa L ; Oloruntoba, DT Date: Dec 2017 Titanium alloys have been used for variety of engineering applications but their relatively low hardness and low thermal conductivity are shortcomings that have reduced their potential use. In this work, attempts have been made to study the ... Read more
Synthesis of Ti-Al-xNb ternary alloys via laser-engineered net shaping for biomedical application: Densification, electrochemical and mechanical properties studies

Author: Kanyane, LR ; Popoola, API ; Pityana, Sisa L ; Tlotleng, Monnamme Date: Jan 2022 The lives of many people around the world are impaired and shortened mostly by cardiovascular diseases (CVD). Despite the fact that medical interventions and surgical heart transplants may improve the lives of patients suffering from ... Read more
Tribological and corrosion properties of laser additive manufactured AlCrFeNiCu high entropy alloy

Author: Malatji, N ; Popoola, API ; Lengopeng, T ; Pityana, Sisa L Date: Feb 2020 High entropy alloys (HEAs) are new class of materials with a high potential to find use in structural applications where high corrosion and wear resistance are required. Their high configurational entropy, sluggish diffusion, cocktail effect ... Read more
Wear-resistant metals and composites

Author: Aramide, BP ; Popoola, API ; Sadiku, ER ; Aramide, FO ; Pityana, Sisa L Date: Jul 2020 Wear-resistant materials (WRMs) have attracted enormous attention because of their general usages in the biomedical, medical, military, automotive, aerospace, and other industrial sectors. The wear of an article causes persistent devaluation, ... Read more

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